Mechanical rotary drier.



W. E. PRINDLE.

MECHANICAL HoARYfnmEm APPLICATION FILED AUG. 5. |915.

Patented Apr. 10,1917.

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ii i` GW a U fe rial being dried s proximately cover that portion which is normally occupied by the dried or nearly dried material as it passes to the conveyer 9 located below the rear open end of this outer cylinder. The distance this inner cylinder extends into the outer cylinder must, of course, be determined, its prime function being to avoid direct contact of the heated products of combustion with the material being treated, reliance being had to alarge de ee upon the radiated heat from this cylinder to complete the drying. The distance this cylinder extends into the outer cylinder may be stated as representing the linal stage of the drying operation and preventsl the hottest gases from contacting with the driest material. This inner cylinder is mountedto rotate. with the outer cylinder by means of arms 10 and 11 arranged in spider relation, the construction being such that the required compensation between the two cylinders due to expansion and contraction, may be had. The forward end of this inner cylinder is further provided with a flaring hood 12, the flare bei-ng provided to prevent the access of the material in case some of it should drop from the upper portion of the outer cylinder tothe inner portion of the inner cylinder and is further provided to. di'use the heated products of combustion in a more .or less degree. This inner cylinder is also preferably lined with some type of refractory materiales is shown at 13 this refractory -lining bein Vused so that the heatedproducts of'com ustion do not come into direct contact with the metallic wall of the inner casing, which would then naturally become heated to a very high degree and which would then be more or less liable to cause a burnin or scorching of the mateould this material come in contact with the metal `portion of this inner cylinder. 'xL

Located adjacent the delivery end o-ithe l `drier as a whole, is a h'otfair producer14,

this producer bei and is provided with the usual typeo'f grate -bars 15 and outlet flue 16,* whichfla-tter lflue connects with the'ue pipe 17 also preferably lined with refractory material as indicated at 18. 'The flue'lp e 17 is then connected with the'l inner' cy inder in any pre ferred manner, it bein essential only that this connection shoulde such that the inner cylinder proper be capable of-rotation,

while the flue pipe 18 i's referably held in a stationary position. e distance between the heat producer 14 and the 'dis charge endofl thedriejr as a whole is closed'.

to theV atmosphere to prevent escape of the dried material in the form of dust and also t prevent ,-the entrance of forei material "at this'p'oint by means of a stat1onary-h md 19 shaped to'conform to the outer cylinderin the form of a furnace" the arch 22 and being provided with an inlet` portion 23 of any desired form.` The rear wall of the furnace is provided with an opening as is shown at 24 in Fig. 5 and this yopening is connected by means of a iue '25 with the rea-r wall of the hood 19 and in this manner this flue 25 also is in communication with the. space formed between the inner and outer cylinders. It will thus appear that I have provided a construction for introducing an auxiliary air support into the rear portion of the cylinder and into that portion of the drier as a Whole, which relies upon its dryin action principally upon radiated heat. y the introduction of this -90 auxiliary air, a direct draft is produced and' the air or heated products of combustion'A thus introduced, are also capable of absorb'ilf-l ing and carrying moisture 1n suspension to' complete the drying operation.` Further,

this draft will more or less temperthe heat -front ring 29 rigidly mounted in connection .Y with'the cylinder 1itself. This vaporbon- -1`10 net 28 also has a central opening formed therein to which is connected the fan'or suction-device connection 30, leading tothe fan or other suitable type of suction 'device shown generally at 31. v

The front end of this cylinderl 1 is also provided with a series of .spiral baille's or flights 32, these flights being located. in cooperative relation with the-lfeedespout26 and being attached at thei-4 "i-iiner'^,e1`i dsfto radiallyv arran llightsgfmr thee( shown at 33. h enumbermt arranged flights preferably-a es lt number of compartments. 341 oirnedjinediatelytothe rear ofthe other words,. i n th" 'portionfljof th' the rear-inf t being? j means' of tlie all. as clearly shown in Fig. 2.- Each of these compartments is provided with a series of bafiles 36, these `bafflesr being con; structed of anglev iron or of combined angle Iiron and knuckle late as may be desired `and asis shown.`

he flights 32 are so arranged t-hat as "the" material is fed into the front-end of thecylinder, it is also fed into the'various comparments' as they pass their.

lowernost positlon. Therefore,"each of the compartments containsv a portion ofthe in troduced wet material' and this wet material is cascaded by means of the bafiles 36.`

I resort to the use of a plurality of compartments, since the drying action is more efiicient where the material is dried in small quantities than where it is cascaded in one entire bulk, because in the former operation this materlal` may be considered as being divided more evenly than Where the entire mass `is cascaded in one bulk. After this portionI of the drier is traversed, the `material enters the portiony 37 which consists of afsectionnot divided up into compartments but provided with a series of angle iron baffle plates 38 arranged in staggered relation, as is shown. In this portion of the `drier the entire bulk Vis cascaded, but it is lat this point that it Y comes into contact with gases which are warmer than those gases encountered at the extreme rear of the casing 1, since this point is closer to the ypoint of emission of these gases from the inner cylinder 8. l y

` In order to prevent the material from being cascaded directly in front of the emitted gases from the inner cylinder 8, I

have provided a section l39 which section The remainlng portion of the outer cylin-y der may beprov'ided with fiights of the type shown at 41 or -any other preferred type of Hight, the remaining portion of the drying operation being accomplished principally by the'rdiated heat and the draft caused by the of heatedv air overthe top ofithe Y furnace 14.v However, this material has practically 'completed its drying operation the action' 39. I

before it enters'the section 'to ther-ight of The operationof mydevice is asfollows: `Rotation is.` g'il'n the 'outer cylndsffby means any" Suitbl f'is( 0f driving irischanismafter' the heat pr ucing unit has been f set in operation and likewise the suction device 31. The wet material is then introduced into the intel ior of the outer cylinder by passage thu-ugh the feed spout26 and the rotation of this outercylinde-r inJ connection with thefpirally arranged flights 32 will feed this irtrodu'ced material lnto the various compartments 34 where it is cascaded duer to the liftin blade structure as is-shown and thereby mmgles very thoroughly with the heated products of combustion admitted through the heat producer 14. This introduced material will travel `,toward the right of the cyl]I nder because. of the inclination 'at which this cylinder is set and will ultimately discharge into the conveyer 9 at the extreme enc'. of the conve er, Dur- ,ing its passage, this material eaves the compartment 34 and enters the section 37 where it is cascaded in bulk.` Here it is Iforced into the section 39 containing the spiral arrangement of fiights 40 and by means of these flights the material is prevented from dropping andbeing cascaded directly in front ot the open end of the inner cylinder 8 through which the highly heated gases from `t 1e urnace 14 issue. By this arrangement this material is prevented from being scorched and burned and is effectively transmittei to` that portion of the drier using radiatec'A heat principally in t dryin operation. [n order thatthis' inner fractory lining as ia; shown and this refractory lining further serves the purpose of preventing too 4elicessive a radiation to cause a burning of the material being cascaded at this pointy` To insure the flow ofy heated air at this point,'I have provided a conduit 25 which connects with the space 21 formed in the upper portion of the furnace and by this means an auxiliary air supply is given. This air supply ymay be used to tem er the heat at this pointof the cylin ler may not itself become burnt due u to the high temperature of the productsl of combustion, I'have ined the same with a re` ico outer cylin er and may further bel used to insure a draft. through the outer cylinder at this point. yThe suction device 3l insuresthefiow of air through the drier as a whole and it is this air which carries the `moisture extracted from the material in suspension. i

From the foregoing, it will be apparent that I have provi ied a type of furnace which ma l .be usec', for' drying material, of

a highly inflammable natureand this drying operation may be carriedon most e ciently. h

What I claim, is: ,y 1. A rotary drier comprising an `outer cylinder provided adjacent its frontk end with a hot air outlet,` means for feeding "material tothe frontend; of said cylinder, a hot air producenmn innercylinder within y'se and in communication with said outer cyl- 1n der and communlcatln at its rearend wlth said producer, said lnner cyllnder extending vinto the rear portion only of said outer cylinder a distance4 to prevent direct contact of the heated gases'withthe material after it has passed through said outer cylinder a distance to be in a. comparatively dry state, a suction device connected to said hot air outlet to cause a ilow of hot air in a direction opposite to the travel of the material through said outer cylinder, and means and communicating 'at its rear end with, said producer, said inner cylinder extending into the rear -portion only of 'said' outer cylinder a distanceto prevent direct contact of the heated gases with the material after it has through said outer cylinder a distance to be in a comparatively dry'state, a suction device connected to said hot air outlet to cause a iow of` hot air in a direction opposite to the travel of the .material through said outer cylinder, and auxiliary means for introducing heated air from said furnace into the rear portion of the space' formed between said Vinner .and cuter cylinders.

3.I A rotary drier comprising an outer cylinder provided adjacent its front end with a hot airoutlet, means for feeding material to the front end of said cylinder, a hot air producer, an inner cylinder within and 1n communicatlon with said outer cylinder and communicating at its rear end with said producer, said inner cylinder extendin into the rear portion only of said outer cy inder a distance to prevent direct contact of the heated gases with the material after it has ,passed through said outer cylinder a distance tobe-ina comparatively dry state, a I suction vdevice ,connected to said hot air outlet to cause a flow of hot air in a direction vopposite to. the travel of the material through'said outer cylinder, a hot air yspace other than its combustion chamber formed in said hot air producer independent of the operation of said producer, and a conduit connecting said space and the space formedbetween said inner and vouter cylinders.

. 4. A rotary drier comprising an outer cylinderl provided adjacent its front end with a hot air outlet, vmeans for feeding material to the front end of'fsaid cylinder, a hot air producer, an `,inner Vcylinder'f-withi'n ,l and '1n conununicatiomwith, router cylinder and communcatingatitsrear with said pmduaysaid linni-.r cylinder email, into the rear` portion only of said outer'cy inder a distance to prevent direct contact of the heated gases with ,the material after it has passed through said outer c linder a distance to 'be in a comparative y dry state, a refracto lining for said inner cylinder, a

l suctionevice connected to said hot air outouter cylinder provided with a. hot air -outy let, a feed means communicating with the interior of said cylinder, an inner cylinder in communication with and within said' outer cylinder, a hot air-producer connected to oneend of said inner cylinder, and means for preventing the cascadin of the material in front of the open end o said inner cyl inder as said outer' cylinder rotates.

6. A rotary drier comprising a rotatable outer c linder provided with a hot air outlet, a fyeed means communicating with the interior of said cylinder, an inner cylinder in communication with land within said outer cylinder, a hot air producer connected to one end of said inner cylinder baies on the interior ofv said outer cylinder,- and a second set of bales on the interiorof said outer cylinder adjacent ftleopexrend of-said inner c lnder arranged to. prevent thedropping o the materia directly past the o en end ofthe inner cylinder as the outer cy inder is rotated.

7. A rotary drier comprising a rotatable 'outer cylinder providedy adjacentits front end with a -hot air'outlet, means for-feedingmaterial into the front end of said cylinder, a hot ir producer, an inner cylinder within and in communication with said outer cylinder and communicating at'its rear. with said producer, said inner cylinder ,extending into the rear portion only of said outer cylinder a distance to prevent direct contact of the heated ses with the material after it has passed t rough said outer cylinder a tance to be in a comparatively dry state, a suction device connected to said hot air outlet to cause a flow of hot air in a direction opposite to 'the-- travel of the material through said outer c linder, and' means for preventin the casca ing ofthe material directly in ront. of the open end of said inner cylinder as said outer cylinder is ro'tated.

- g8., A rotary drier comprising a rotatable outerc` nderf provided adjacent its front endlwit a hotair outlet, means for fee the yfrontend of said cylinder,

ah irproducerf'an inner cylinder within i lmcon,imumeation 'with Asaid, outer cylinder andcommunicating at its rear with said l t rough y producer, said inner cylinder extending into therear portion only of said outer cylinder a-distancefto preventdirect contact of the heated gases with the material after it has passedv through said outer cylinder a distance to bein acomparatively dry state, a suction device connected to said hotair outlet to cause a iow of hot air in a direction o posite to the' travel of the material .t rou h said outer cylinder, and a series of spiral y arranged baiiles on the inside of said outerc linder arranged to prevent the cascading o the material directly in front of the open end of said inner cylinder as said outer cylinder is vrotatede` 9. A rotary drier comprisinga rotatable outer c linder provided with a hot air outlet, a eed means communicating with the interior @of said cylinder, a hot air producer,

an inner cylinder being also in communication with said producer, and a series of lon- 'tudinally extending compartments formed 1n said outer cylinder inthe space not occupied by said `inner cylinder. e

10.y A rota drier comprising a rotatable outer cyllinder provided adjacent its front end wit` a hot air outlet, means or'feeding material into the front end of said cylinder, a hot air producer, an inner cylinder within and in communication with said outer cylinder and communicating at its rear with said producer, said inner cylinder ,extendin into the krear portion only of said outer cylinder adistanc'e to prevent direct contact of the heated gases with the material after it has passed through' said outer cylinder a distance to be in a comparatively dry state, a suction device connected. tov said, hot air lolitlet to canse a now of hot air in a direction optisit'e to `the travel of the material said outer cylinder, a series of spiral arranged baliies on the inside of said outer cylinder arranged to'prevent ythe casvcalling of the material directly in front of the cpen end of said inner cylinder as said outer` cylinder is rotated, and a series of spiral bales located in said outer cylinder between said `feed means and said compartments to direct the material into the compertinents.

eater eyli'nder provided edjeeedt its trent vend with a hot air outlet, means for feeding material into the front end of said cylinder,

a hot air producer, an innercylinder within and in communication with said outer cylinder and communicating at its rear with said A'fifodlicelg said inner cylinder extending into he rear portion cnly of said outer cylinder ya. distance to prevent direct contact of the heated gases wit the material after it has assed through seid eater `cylinder e `disancejtol be 1n a comparatively dry state, a suctin device connected to said hot air utlet te cause a iiow of hot air in a direc- 11. A rotary drier comprising a rotatable cadingjof the material Adirectly in front of` the open end of sa id inner cylinder as said outer cylinder is rotated.

12. A rotary drier comprising a rotatable outer cylinder pre vided adjacent its front end with a hot air outlet, means for feeding material into the front end of said cylinder, a hot air producer, an inner cylinder within and in communication with said outer cylinder and communicatin y at its lrear with said producer, a series o longitudinally extending compartments formed in said outer cylinder in the sp ice not occupied by said inner cylinder, sait. inner cylinder extendin into the rear porti 1n only of said outer cy inder, and a suction device connected to said hot air outlet to ca usea flow of hot air in a direction opposite to the travel of the material through said outer cylinder. n

13. A rotary drier comprising a rotatable outer cylinder provided adjacent its front end with a` hot air. outlet, means for feeding material into the front end of said cylinder,

a hot air producert an inner cylinder within and in communication with said outer cylin: der and communicating at its rear with said producer, a series of lon 'tudinally extendin compartments forme in said outer cylin` er in the space not occupied by said 1nner cylinder, said inner cylinder-,extending into the rear portion only of said outer cylinder, a suction device connected to said hot air outlet to cause a flow of hot air in a direetion opposite to theltravel of themat'erial through saidouter cylinder, and means for permitting an infiow of auxiliary air into the rear of said cuter u cylinder and in the space between it a'id said inner cylinder.y y

14. A rotary drier comprising a rotatable t t Witliin and in communication with said outer cylinder `and communicating at its rear end with` said produce r, said inner cylinder extending into the rear portion of said outer cylinder a distance to 4`revent direct contact of the heated ases with thematerial after it has passed t rough said outer cylinder a distance to be in t comparatively dry state, a series of longitudinally extending coinpartm'ents formed insaid outer cylinder lin the space not occupied by said inner cylinder,

means for,` prevenzin the cascading of the material directly in rontyof the open end t of said inner cylinder as said outer cylinder is rotated,- and a suction device` connected with seid hot air outlet te cause the new ef hot air a direct ion of posite `tothe travel of material through sai outer cylinder.

15. A rotary driercomprising a rotatable outer cylinder provided adjacent its front end with a hot air outlet, means for feeding material into the front end of said cylinder, a hot air producer, an inner cylinder ywithin and in communication with said outer cylinder and communicating at its rear end with said producer, said inner cylinder extending into the rear portion of said outer cylinder a distance to prevent direct contact of the heated gases with the material after it yhas passed through said outer cylinder a distance to be in a comparatively dry state, a series of longitudinally extending compartments formed in said outer cylinder in thefspace not occupied by said inner cylinder, means for preventing the cascading of the material directly in front of the open end of said inner cylinder as said outer cylinder is rotated, a suction device connected with said hot air outlet to cause the flowbf hot air in a direction opposite to the travel of material through said outer cylinder, and means for rmitting an inflow of air into the rear o said outer cylinder and in the space between it and said inner cylinder.

16. A rotary drier comprising a rotatable outer cylinder provided adjacent' its front end with a hot air outlet, means for feeding material into the front end of said cylinder, a hot air producer, an Inner cylinder within and in communication with said outer cylinder and communicatin at its rear with said producer, said inner cy inder extending into the rear portion of said outer cylinder a distance to prevent direct contact of the heated gases with the material after it has .passed through said outer c linder a distance to be in a comparative y dry state, a series of lon tudinally extending compartments forme insaid outer cylinder in the space not occupied by said inner cylinder, a series of spiral bales located in said outer cylinder between said feed means and said compartments to direct the material into the compartments, a second series` of spiral bafiles on the inside of said outer cylinder arranged to prevent cascading of the material directly in front of the 'open end of said inner cylinder as said outer cylinder is rotated. auxiliary means for introducing heated air fromsaidfurnace into the rear portion of the space formed betweenV said inner and outer cylinders, and a suction device connected to said hot air outlet toV cause a flow .of air in a direction oppositeto the travel of the material through 'said outer cylinder.

In testimony whereof I ailix my signature in presence of two witnesses.

WILLIAM E. PRINDLE. Witnesses: v

H. M. CHANEY,

WALTER E. L. Boex. 

